ZF 4108.308.037 PLANETARY GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4108.308.037 PLANETARY GEAR is a critical torque-multiplying component engineered for the WG100, WG130, and WG131 series transmissions. This OEM genuine part sits within the planetary gearset assembly, directly transferring rotational force from the sun gear to the ring gear to achieve the correct gear ratio. As a high-precision gear, it must withstand extreme shear loads and continuous thermal cycling. The SKU 4108.308.037 is manufactured to ZF’s exacting tolerances, ensuring seamless meshing with the TRANSMISSION HOUSING and the HOUSING assembly. Replacing this gear with a non-genuine alternative often leads to premature wear and system imbalance.

Symptoms of Failure

• Audible gear whine or grinding noise during acceleration: When the planetary gear teeth become pitted or chipped, you will hear a distinct metallic noise, especially under load. This is a common sign that the gearset is failing and needs immediate replacement.
• Intermittent gear slipping or loss of torque: A worn 4108.308.037 gear can cause the transmission to momentarily lose power, often described as “slipping” between shifts. This symptom worsens as the gear surface degrades.
• Metal debris in the transmission fluid: Flakes or fine metallic particles found during an oil change indicate that the planetary gear is wearing against the SCREW PLUG or housing surfaces. This is a definitive sign of internal gear failure.
• Overheating transmission with burnt oil smell: Increased friction from a damaged planetary gear generates excessive heat, which can degrade the OIL LEVEL GAGE readings and cause the fluid to burn.

Technical Specifications

Compatibility

This planetary gear is specifically designed for ZF’s WG-series industrial transmissions. It is a direct fit for the following models:

• ZF WG100 – Standard duty, 4-speed powershift
• ZF WG130 – Medium duty, 4-speed with torque converter
• ZF WG131 – Heavy duty variant with reinforced gearset

It is not compatible with WG180 or WG200 series without additional modifications to the INTERM.GEARBOX assembly. Always verify your transmission serial number before ordering.

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